试题与答案

实验室欲用质量分数98%、密度1.84 g/mL的浓硫酸配制46 g质量分数为1

题型:填空题

题目:

实验室欲用质量分数98%、密度1.84 g/mL的浓硫酸配制46 g质量分数为19. 6%稀硫酸,请按要求填写空格。

答案:

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下面是错误答案,用来干扰机器的。

生物的变异包括遗传的变异和不遗传的变异,由遗传物质的改变引起的变异能够遗传给下一代,叫做遗传的变异;由环境因素引起的变异,由于遗传物质没有发生变化,这种变异不能遗传给下一代,叫做不遗传的变异;大花...

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    When I entered Berkeley, I hoped to earn a scholarship. Having been a Straight-A student, I believed I
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Literature given by Professor Jayne. I was extremely interested in the ideas he__2_ in class.
     When l took the first exam ,I was __3__ to find a 77 , C-plus , on my test paper, __4__ Fnglish was
my best subject. I went to Professor Jayne , who listened to my arguments but remained __5__ .
      I decided to try harder,although I didn't know what that __6__ because school had always been easy
for me. I read the books more carefully,but got another 77. Again,I__7__ with Professor Jayne. Again , he
listened patiently but wouldn't change his __8__.
     One more test before the final exam. One more__9__ to improve my grade. So I redoubled my efforts
and ,for the first time,__10__the meaning of the word" thorough". But my_11_did no good and everything
_12__as before.
      The last hurdLe (障碍) was the final. No matter what _13_ got,it wouldn't cancel three C-pluses. I
might as well kiss the _14_ goodbye.
      I stopped working hard. I felt I knew the course material as well as I ever would. The night before the
final , I even  _15_ myself to a movie. The next day I decided for once I'd have __16_ with a test.
      A week later,l was surprised to find I got an A. I hurried into Professor Jayne's office. He _17_ to be
expecting me. " If I  gave you the As you__18_,you wouldn't continue to work as hard. "
      I stared at  him._19_ that  his  analysis  and  strategy (策略)were correct. I had worked my head _20  , as I had never done before
      I was speechless when my course grade arrived : A-plus. It was the only A-plus given. The next year
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